构造函数接受一个由观察到的频率组成的数组、alpha 概率断开点（cutoff score）和一个可选的期望概率的数组。
The constructor accepts an array of observed frequencies, an alpha probability cutoff score, and an optional array of expected probabilities.
用循环计数法求出载荷及应力幅频率分布，用概率密度函数拟合，为疲劳设计提供可靠性高的数据资。
The loads and the distribution of stress amplitude frequency are obtained by cycle count and reliable data for fatigue design are provided by probability density function fit.
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